Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dca6cc64d84a434…

MALICIOUS

PDF

91.9 KB Created: 2021-02-05 16:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 2f91ba4454b9f23228aad44caa563bca SHA-1: 1d1e99bb5eda3ee003ee318647658e17e76ea52b SHA-256: 8dca6cc64d84a4343106ae180e109c1b20748c5bcd7d4c6cf4c45fca9c82750f
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wb?keyword=latest%20american%20action%20movies%202018 In PDF document text
    • http://sreview.online/partitioning_thousands_hundreds_tens_and_units_worksheetst91gf.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/gfji6ha/15707790207.pdfIn PDF document text
    • http://spainsale.pro/c_t_o_ka_full_formo5cj1.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/HxhfhgZ/super_bomberman_5_menu_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/UNgcCjh/86198920757.pdfIn PDF document text
    • https://midupupivubol.weebly.com/uploads/1/3/5/3/135343472/4021893.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/dhfgdjg/fatuzavibotibi.pdfIn PDF document text
    • https://riwivado.weebly.com/uploads/1/3/0/7/130739124/4966158.pdfIn PDF document text
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/kufogeb.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/photo_editor_collage_maker_pro_apkpurem9at4.pdfIn PDF document text
    • https://xaxiduxaze.weebly.com/uploads/1/3/5/3/135308656/divugeladivajamoxuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tomaxade/abrsm_piano_grade_1_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/bach_cello_suite_3_prelude_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/bye_bye_dubai_all_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/collecting_marbles_a_beginner_s_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 5436 bytes
SHA-256: a725599f0f74164ee8bbfa19bdb5fa5f584cbb7f4d4fff46e649e4a33b600cda
font_01_sfnt_off00013cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 11316 bytes
SHA-256: ddd706e6ebbf38cf99e1d71c1fae21a2c7d89af30bf0784af3593668d8616e35

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